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Prev Professional Automotive Repair Technical Discussions for July 23, 2012
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Open Help Requests for GM
Help Request Answers
2006 Cadillac SRX 3.6L Timning chains VIN: 1GYEE637X6
I'm getting ready to do timing chains on this Cadillac and I don't have any of the timing chain specialty tools. According to OTC, the part # is a 6686 but i'ts not available to the after market till nov 29th. Can I use anything else to align these marks. Has ...
2003 Chevrolet Malibu 3.1L Accessories VIN: 1G1ND52J23
hi guys i have 2003 chevy malibu customer state after 1 hr of drivingwith a/c system on engine rpm 1500 i replaced iac valve and clean the throttle body check for vacuum leaks none replaced tps check out wiring any idea guys thank you
2004 Chevrolet Cavalier 2.2L MIL Lamp on VIN: 1G1JC52F34
The car came in with the service engine light on. With a trouble code P0455.This should be simple and straight forward " right ". About 40,000 miles ago it had the same code , after doing our test with our EVAP smoke machine we determined the vent was bad so w... Trouble codes: P0455 (EVAP large leak)
2005 Chevrolet Trailblazer LS 4.2L Spark knock at idle VIN: 1GNES16S15
when hot(210`)spark knock can be heard at idle in gear only,If we add small spray of carb cleaner niose stops instantly but returns when you stop spraing carb cleaner.We have cleaned combustion chamber(motor vac)also pressure flushed injectors,and added 5 gal....
2009 Chevrolet Silverado 2500 HD LTZ 6.6L Temp gauge VIN: 1GCHK63659
Truck came in with temp gauge maxed out, thought is might be a bad stepper motor but I could command the gauge to all positions with my scan tool. With the CTS unplugged I get 189 degrees on my dash and on my scan tool, with it plugged in it reads 289 on scan ...
1997 GMC K2500 Sierra SL 6.5L boost VIN: 1GTGK29F7V
Ok p0236 is the code. While i was relocating the (black, new in 2010) pmd i notaced there was no resistor chip inside there the harness plugs in, should there be one ? Also the truck shows 14 lbs of boost at idle and goes up to 18 at full throttle. I might be ...
2003 GMC Safari 4.3L Front evaporator VIN: 1GKDM19X33
The front evaporator output is always about 8 degrees warmer than the rear, and both are warmer than we expect to see. We have checked the blend door operation and it is OK. The evaporator temperature at the accumulator is only about 60 degrees. We have change...
2007 GMC Yukon Denali 6.2L Odometer VIN: 1GKFK638X7
Thanks in advance for any help! IPC message display and odometer are inoperative. No codes and everything else in the ipc works correctly(guages and bulbs). No codes present or prior history available. Any suggestions would be appreciated before I play swaptro...
2008 GMC Envoy SLT 4.2L tractions lights come on VIN: 1GKDS13S28
Need some help with this one guys. Traction and service lights come on interm. Pulled codes and found c0455 set. Not to uncommon. Steering position showed erratic on scan tool so we replaced sensor. cleared code and roadtested. Alls great. Roadtested again and...
2000 Pontiac Grand Am GT 3.4L Cooling Fans VIN: 1G2NW12E1Y
This Grand Am's radiator fans (dual) run all the time, even with the key off. They run until the battery is dead. Replaced the three fan relays, checked all fuses. Both fans run at Low and at High speeds, the problem is they never turn off. With the key off an...
2002 Pontiac Grand Prix SE 3.1L speedometer/tach VIN: 1G2WK52J02
The customer stated the vehicle's speedo will slightly vary with the cruise control on at approximatly 60 mph,ive noted it doing this going from 60 to rougly 65. The customer did stated that the tach (engine speed will slightly vary as well in addition to it a...
2003 Saturn L300 3.0L 1st shift VIN: 32R34T45Y3
Hi ! i been doing some reserh on this problem and im at my dead end. Pls help . The car runs great on cold but after a few miles at a complete stop. As soon i hit the gas ill vibrate just a little . At firs it seem like a transmission mount but no chek and lik...
2008 Saturn Vue XE 3.5L extended crank VIN: 3GSDL43NX8
vehicle came in with extended crank and occasional misfire; tested fuel pressure at test port and observed pressure drop from specified value koeo. Assumed check valve (part of fpm) was bad so replaced fuel pump module. Upon restart after replacement, same res...

Fixes & Summaries for GM
Fix/Summary Answers
2002 Chevrolet Express 2500 4.3L Lack of power VIN: 1GCGG25W52
Once again thankyou all for your time and responses. This one is fixed it was a bad torque converter. Not sure why it backed timing down so far?? I got fixated on the timing thing. Before changing the converter I took it for a good test drive (tech did before)...
2008 Chevrolet Silverado 2500 HD LTZ 6.0L brakes, steering VIN: 1GCHK23K38
Well, as i figured, it was a bad hydroboost, thanks to all who replied with the same idea i had. Replaced the boost and fired it up and all is well.
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